Peerless Pump Company Pump C740

Enter the complete pump nameplate data when ordering repair parts

Remove burrs, nicks, and scratches from non-critical areas with a fine stone or crocus cloth

Has the pump capacity fallen off due to wear on the impeller and casing ring?

Replace the casing ring if the pump capacity has fallen off

Measure the inside diameter of the casing ring

Measure the impeller skirt diameter

Is the inside diameter of the casing ring 0.008" to 0.012" larger than the impeller skirt diameter?

Replace all gaskets, O-rings, and seals during reassembly

Reassembly — Mechanical Seal Type

Lubricate O-ring (65B), groove in floating seat (65A) and seat cavity in adapter (71)

Install floating seat in the adapter with lapped surface facing away from adapter shoulder

Apply lubricant to entire surface of shaft sleeve and install adapter

Install screws and tighten uniformly

Rotate shaft by hand to check for binding or hang-up

Lubricate shaft sleeve and bores of sealing washer (80D) and spring bellows assembly (80C)

Inspect lapped surfaces for damage

Are the lapped surfaces free from defects?

If lapped surfaces are damaged, replace the entire seal

Monitor for seal leakage during operation

Is there any seal leakage indicating damage?

Replace all seal parts at each disassembly

Visually inspect and replace parts that are damaged and affecting the serviceability or sealing

Emphasize inspection of mating parts having relative motion — casing rings, for example

Check O-rings, gaskets, and seals for shrinkage, cracks, nicks or tears

Check packing rings for excessive compression, fraying or shredding, embedded particles (dirt or metal) — replace if defective in any way

Examine impeller passages for cracks, dents, gouges or embedded material

Inspect shaft sleeves (14) for excessive wear — replace sleeves that are worn

Inspect lapped surfaces of sealing washer and floating seat for chipping, gouges, nicks, scratches or other damage — these surfaces must be free from any defect — if lapped surfaces are damaged, replace the entire seal

Disconnect power to the pump driver

Refer to Bulletin No. 2880549 for the pump removal procedure

Ensure pump is operated within specified parameters

Ensure correct liquid is being pumped

Pump Disassembly - Mechanical Seal Type

Remove seal piping between pump discharge and stuffing box of adapter